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Investments - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |
Other investments, at cost | $ 26,654 | $ 26,661
Maximum percentage of shareholders' equity security holdings held of one issuer | 10.00% |
Available-for-sale securities pledged as collateral, fair value | $ 433,700 | 500,000
Mortgage-backed securities, weighted average life | 4 years |
Des Moines |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Other investments, at cost | $ 9,200 | $ 12,900

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